Tag: M.W=400-500

Category: esters-buliding-blocks. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about MOCVD of thin mixed-conducting films on porous ceramic substrates. Author is Stiens, Dirk; Wahl, Georg; Garcia, Gemma; Van Veen, Andre; Rebeilleau, Michael.

Dense layers of La nickelate were deposited by MOCVD on tubular porous ceramic substrates (100 mm length, 10 mm outer diameter, 110 nm pore size). Initial room temperature N leak rates of the layers of ≈18 μm thickness were as low as 7 × 10-8 mol s-1 cm-2 at Δp = 0.5 bar. Uniform film composition and thickness over the entire substrate length was verified by cross-sectional SEM and EDX anal. XRD anal. showed that the deposited material obtained at 480° is amorphous. Annealing at 800° lead to formation of a mixture of La2NiO4 and LaNiO3 phases.

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Foulds, Gary A.; Bennett, Alison M.; Thornton, David A.; Brown, Stephen J.; Clutterbuck, Linda M.; Hinton, Cassandra; Humphreys, Geoffrey B.; Masters, Anthony F. published the article 《Ligand donor atom and substituent effects in olefin oligomerization and isomerization catalyzed by nickel-based catalyst systems》. Keywords: olefin isomerization oligomerization catalyst; nickel based catalyst.They researched the compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)( cas:14481-08-4 ).Computed Properties of C22H38NiO4. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:14481-08-4) here.

The olefin oligomerization and isomerization catalytic activities and selectivities of catalysts generated by combining [Ni(RC(X)CHC(Y)R)2]n (R = Me, X = Y = O, n = 3; X = O, Y = NH, n = 1; X = O, Y = S, n = 1; X = Y = S, n = 1; and R = tert-Bu, n = 1, X = Y = O; X = O, Y = S; X = Y = S) and [Ni(CH3C(S)CHC(S)CH3)(PR3)Cl] (R = alkyl, aryl) precursors with [Et6-xAl2Clx] (x = 0, 2, 3, 4, 6) co-catalysis have been compared. All catalysts exhibit some olefin isomerization activity, but only those generated from precursors containing oxygen-donor ligands exhibit olefin oligomerization activity. Olefin oligomerization is also favored by the use of [EtAlCl2]2 as a co-catalyst. Almost no activity for either olefin oligomerization or isomerization was observed when using [Ni(CH3C(S)CHC(S)CH3)2] as a catalyst precursor. However, extremely active olefin oligomerization and isomerization catalysts could be generated from [Ni(CH3C(S)CHC(S)CH3)(PBu3)Cl] and appropriate co-catalysts. The mol.-weight of the products could be controlled in these systems by varying the co-catalyst. The catalysts with the most sustained high activity were those generated from [Ni(CH3C(S)CHC(S)CH3)(PBu3)Cl].

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Electric Literature of C22H38NiO4. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Preparation of dense, ultra-thin MIEC ceramic membranes by atmospheric spray-pyrolysis technique. Author is Abrutis, A.; Teiserskis, A.; Garcia, G.; Kubilius, V.; Saltyte, Z.; Salciunas, Z.; Faucheux, V.; Figueras, A.; Rushworth, S..

Dense ceramic mixed ionic and electronic conducting membranes have been deposited by atm. spray-pyrolysis technique onto porous ceramic substrates. Perovskite oxide layers, i.e., manganites La1-xSrxMnO3, ferrites La1-xSrxFe1-y(Co,Ni)yO3, gallates La1-xSrxGa1-y(Co,Ni,Fe)yO3, cobaltites La1-xSrxCoO3 and related perovskites such as lanthanum nickelate La2NiO4 layers have been prepared The structure, morphol. and composition of the layers were characterized by XRD, SEM and WDS, resp. D. and gas tightness of the layers were studied as a function of deposition process parameters, film thickness (0.5-3 μm) and preparation procedure. The presence of cracks and defects due to thermo-mech. stresses applied during or after the preparation process were correlated with the membrane composition and the corresponding thermal expansion coefficient differences between substrates and membranes.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Molecular association and electronic structures of Ni(II) chelates. I. Complexes of pentane-2,4-dione and some 1,5-di-substituted derivatives》. Authors are Cotton, F. A.; Fackler, J. P. jr..The article about the compound:Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)cas:14481-08-4,SMILESS:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C).COA of Formula: C22H38NiO4. Through the article, more information about this compound (cas:14481-08-4) is conveyed.

The anomalous magnetic and spectral behavior of some planar Ni(II) complexes, under certain conditions, is due to the mol. association of the solute mol. in solvents of low coordinating power. The magnetic moment and spectrum of bis(2,6-dimethyl-3,5-heptanediono)Ni(II) dissolved in toluene depend on both temperature and concentration Spectral and magnetic data at 0-50° and 0.24-0.010M are presented with the thermodynamic parameters of the association process. The more highly hindered bis(2,2,6,6-tetramethyl-3,5-heptanediono)Ni(II) remains diamagnetic under all conditions. Bis(2,4-pentanediono)-Ni(II) is associated in noncoordinating solvents at ordinary temperature, with significant concentrations of red monomer occurring only at ∼200°. Structures for the polymeric species are considered. Ni(OAc)2.4H2O (1.5 g.) was dissolved in 10 ml. absolute MeOH and the solution added to 5 ml. of MeOH containing a slight excess of freshly distilled 2,6-dimethyl-3,5-heptanedione; 5 ml. of H2O was added, the product was removed by filtration, and vacuum dried at 100° over P2O5. The product was recrystallized from C2H4Cl2, sublimed in vacuo at 150° to give bis(2,6-dimethyl-3,5-heptanediono)Ni(II), m. 155° (sealed tube). Bis(2,2,6,6-tetramethyl-3,5-heptanediono) Ni(II), m. 217-21°, was prepared similarly.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Electronic spectra of planar chelate nickel(II) complexes, the main research direction is electronic spectra nickel complex; crystal field nickel complex.Name: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II).

The electronic spectra of NiL2, where HL is dipivaloylmethane, N,N-diethyldithiocarbamic acid, di-Et dithiophosphoric acid, ethylmethylglyoxime, and dimethylglyoxime, were interpreted by crystal field and angular overlap methods. The real geometries of the complexes were used in these interpretations. The effect of the chelate angle (α) on the s-d mixing as well as that of the configurational and spin-orbital interaction on the transition energies were traced. The parameters derived from the d-d spectra anal. were used to interpret the charge transfer spectra and the d-photoionization energies, calculating the deviations from the d-multiplet baricenter.

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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Metalation of etioporphyrin I with nickel(II) 1,3-diketonates, published in 1973, which mentions a compound: 14481-08-4, Name is Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), Molecular C22H38NiO4, Synthetic Route of C22H38NiO4.

Kinetic studies of the reaction H2L + NiL12 → NiL + 2HL1 (H2L = etioporphyrin I, HL1 = 2,4-pentanedione, 1,1,1-trifluoro-2,4-pentanedione, 1,1,1,5,5,5-hexafloro-2,4-pentanedione, 2,6-dimethyl-3,5-heptanedione, 2,2,6,6-tetramethyl-3,5-heptanedione, and 1,3-diphenyl-1,3-propanedione) show that the reaction is 1st-order with respect to H2L and either 1st-order or zero-order with respect to NiL12. The presence of trace amounts of H2O inhibits the reaction. NiL12 complexes serve as a metal source in the facile preparation of Ni porphyrins.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Mechanisms of photoreactions in solution. XX. Quenching of excited states of benzophenone by metal chelates》. Authors are Hammond, George S.; Foss, Robert P..The article about the compound:Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)cas:14481-08-4,SMILESS:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C).Recommanded Product: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). Through the article, more information about this compound (cas:14481-08-4) is conveyed.

Metal chelate compounds containing ligands derived from β-diketones show variable reactivity as quenchers in the photoreduction of benzophenone by benzhydrol. Reactivity varies both as a function of the nature of the central metal atom and of the ligand. There is no correlation between quenching activity and the magnetic properties of the ground states of the chelates. Two possible mechanisms for quenching are discussed but no selection between them is attempted.

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Product Details of 14481-08-4. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Molecular characterization of nickel and vanadium nonporphyrin compounds found in heavy crude petroleums and bitumens.

Electron impact mass spectroscopy (EIMS) anal. of the fractions of pyridine/water extracts of selected crude petroleums, separated by HPLC indicated V porphyrins in Cerro Negro and Wilmington moderate polar fractions and possibly in the Wilmington low polar fraction. The EIMS results provided no addnl. information on the metallo-nonporphyrins. Further purification of the highly polar fraction of the Wilmington crude petroleum extract showed the bonding for ≥1 type of Ni-containing nonporphyrin compound This Ni is bound as carboxylates. HPLC anal. of gilsonite (bitumen) indicated that the Ni is predominantly bound as metallopetroporphyrin, while a small portion eluted as a highly polar metallo-nonporphyrin fraction.

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Steib, Philip; Breit, Bernhard published the article 《Concise Total Synthesis of (-)-Vermiculine through a Rhodium-Catalyzed C2-Symmetric Dimerization Strategy》. Keywords: vermiculine total synthesis rhodium catalyzed enantioselective dimerization; Wacker-type oxidation; antibiotics; dimerization; metathesis; total synthesis; vermiculine.They researched the compound: (((4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine)( cas:32305-98-9 ).Application In Synthesis of (((4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine). Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:32305-98-9) here.

A short and efficient synthesis of the C2-sym. antibiotic (-)-vermiculine (I) by utilizing an enantioselective catalytic one-step dimerization methodol. as key-step to construct the core structure is reported. The late-stage modifications feature a double metathesis homologation followed by a double Wacker-type oxidation These key-steps allowed the synthesis of vermiculine in only seven steps, starting from com. available building blocks.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: (((4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine), is researched, Molecular C31H32O2P2, CAS is 32305-98-9, about Nickel(0)-Catalyzed Asymmetric Ring Expansion Toward Enantioenriched Silicon-Stereogenic Benzosiloles, the main research direction is benzosilole silicon stereogenic chiral preparation fluorescence CD spectra absorbance; crystal structure mol benzosilole silicon stereogenic chiral preparation; nickel catalyst stereoselective ring expansion chiral silacyclobutane; C-Si bond cleavage; asymmetric catalysis; chiral benzosiloles; silacyclobutanes; silicon-stereogenic center.Name: (((4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine).

The development of a straightforward strategy to obtain enantioenriched silicon-stereogenic benzosiloles remains a challenging yet appealing synthesis venture due to their potential future application in chiral electronic and optoelectronic devices. In this context, all of the existing methods rely on Rh-catalyzed systems and are somewhat limited in scope. Herein, we disclose the first Ni0-catalyzed ring expansion process that enables the preparation of benzosiloles possessing tetraorganosilicon stereocenters in excellent yields and enantioselectivities. The presented catalysis strategy is further applied to the asym. synthesis of silicon-stereogenic bis-silicon-bridged π-extended systems. Preliminary studies reveal that such compounds exhibit fluorescence emission, Cotton effects and circularly polarized luminescence (CPL) activity.

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